Delta Education Hova-Bator Circulated Air Incubator mildly protects and warm eggs. Circulated air incubator measuring 18 in x 18 in x 9.5 in uses circulated airflow to gently warm the air and eggs. Circulated air incubator features thermal action of heated air flowing out the exhaust vents at the top also draws fresh air in through the bottom vent, which helps dry the chicks after they hatch. Circulated air incubator is reliable, economical incubator that can hold up to 42 large poultry eggs.